SmarTek Systems SVS-1 User Guide-Part B - Manual (Page 43)

SVS-1 – Detection Zone Sensitivity Parameters (continued)
No Motion Timeout – Specifies the amount of time in minutes that must pass in the absence of detectable motion before
the system samples the Line Zone pixel values to test and update the Line Zone background. The value for this
parameter must be greater than the amount of time vehicles sit stationary at a red traffic light. The default value for
this parameter is 1 minute. Increase this value for urban intersections (which use a longer cycle time) and decrease this
value for rural intersections (which use a shorter cycle time).
Motion Threshold Factor – Specifies the multiplication factor used with the Circle Zone Motion Detector Threshold
for detecting vehicle motion in a Line Zone. The default value for this parameter is 1.5.
Background Match Threshold – Specifies the error threshold to be used when testing a current sample of LZ
pixel values to determine if they represent background. The default value for this parameter is 5.0.
After setting the parameters for a specific Line Zone (and corresponding Circle Zone), the
parameters for all other zones may be set to the same values using the
Set Parameters for All
Zones button. This does not change positions of the zones, just the sensitivity parameters.
No Motion Threshold - Specifies the threshold used for each Line Zone motion detector to determine the
absence of vehicle motion in the line zone. The default value for this parameter is 4.0.
Background Selection Enable Harmonic Threshold – Specifies the Harmonic Threshold used to enable Line Zone
pixel values selection for testing and updating the LZ background. The default value for this parameter is 10 for
Thru lanes, default for left turn lanes is 20.
RE Select Threshold– The default value for this parameter is 30 for all lanes. Do not change without first
consulting SmarTek Systems’ personnel.